CABOCHON OVAL LABRADORITE 70.4CARATS RT701

Item Information

Dimensions (mm)

40 x 25 x 0mm

Weight (carats)

not provided

Colors

Certified Gemstone

THIS PIECE NATURAL LABRADORITE

SOURCE MAGDAGASCAR

GOOD CABOCHON

SIZE40X 25X 7 MM

Labradorite ((Ca,Na)(Al,Si)4O8), is a feldspar mineral, an intermediate to calcic member of the plagioclase series. It is usually defined as having "%An" (anorthite) between 50 and 70. The specific gravity of Labradorite gemstones ranges from 2.71 to 2.74. The refractive index ranges from 1.555 to 1.575.

Twinning is common in Labradorite. As with all plagioclase members, its crystal system is triclinic. Three directions of cleavage are present, two of which form nearly right-angle prisms. Labradorite occurs as clear, white to gray, blocky to lath-shaped grains. It's found in common mafic igneous rocks such as basalt and gabbro, as well as in anorthosites.Red Labradorite gemstones is also called Oregon sunstone. Red Labradorite Andesine is a member of the Feldspar group. Andesine is a rich Red. Red Labradorite - Andesine, has a hardness of 6 to 6.5 on the Mohs scale

The geological type area for natural Labradorite is Paul's Island, near the town of Nain in Labrador, Canada. It occurs in large crystal masses in anorthosite and shows an iridescence or play of colours. The iridescence is the result of light refracting within perthitic lamellar intergrowths resulting from phase exsolution on cooling.

As a collector of gem and mineral specimes its very hard to find a good supplier. Well Gem Rock Auctions are deffinatly the best place to shop for that amazing specimen. Thankyou from me to the team at Gem Rock Auctions.
Regards David Australia.